<body>

  <div class="alert alert-warning" *ngIf="!isConnected">
    <strong>WARNING</strong>: the app is currently <i>offline</i>:
    some features that rely upon the back-end might not work as expected.
    This message will automatically disappear
    as soon as the internet connection becomes available again.
  </div>

  <app-nav-menu></app-nav-menu>
  <div class="container">
    <router-outlet></router-outlet>
  </div>
</body>
